As I stated in one of my replies they didn't test for anything. My dog has a very sensitive stomach so this is something I deal with on occasion, usually when he comes back from the kennel. I always bring my own dog food when I take him to the kennel but I have no proof they are actually feeding him it.
If my dog exibited any other symptom of illness then I would worry. He still eats everything infront of him and still bounces off the walls with engery. My vet did ask for that information before they gave him all the medications and told me if it doesn't go away to come back. Personally I actually prefer this method. I'd rather treat it as general case first before spending hundreds on tests.
I am well aware that dogs are expensive. I knew what I was signing up for when I adopted him, but there is a line between what is necessary and what isn't. I know he could have gotten a lot from the kennel, last time he came back with a cold that had his miserable for a few days. In fact that is the only time I've never seen him bouncing off the walls with energy.